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Manufacturing Technology Insights | Tuesday, February 08, 2022
Valmet provides sophisticated fiber supply control to ensure the optimal operation of refineries.
FREMONT, CA: "In the one and a half years since the project started, the reduction in web breaks due to the more homogenous fiber furnish resulted of several extra days of production. The best thing was the positive feedback from the operators on how they were able to focus more on controlling the machine when making grade changes," states Ismo Joensuu, Manager, Board & Paper Analyzers, Automation business line, Valmet. Valmet presents the Valmet Fiber Furnish Control application suite for board and paper manufacturers to optimize refiner operation and ensure furnish quality. The control system incorporates advanced feedback and feedforward solutions and model predictive control based on real-time measurements of different fiber characteristics and freeness. Valmet Fiber Furnish Control can be completely connected with an existing Valmet DNA Automation System or Valmet IQ Quality Control System. Additionally, the solution is available in a stand-alone configuration that includes all essential basic licenses and hardware.
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During the development period, the Valmet Fiber Furnish Control's control performance was rigorously monitored for 18 months at a mill in Finland, where the solution assured that stock production and quality targets were met while reducing energy consumption on two fiber lines. In the fiber refining lines, freeness variability was decreased by 30 percent to almost 70 percent when the control was installed.
Traditionally, refiner controls have been based on precise energy or freeness targets and have considered critical fiber qualities such as fiber length, fines, shives, and fibrillation. The Valmet Fiber Furnish Control can be connected to a Valmet Fiber Furnish Analyzer, which continuously monitors and adjusts the specific energy setpoint for goal freeness. Another critical control component is Valmet's consistency measures, which ensure the reliability and accuracy of the stabilizing control functions.
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